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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * |
4 | * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) | |
5 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
6 | * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk) | |
7 | * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org) | |
8 | * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) | |
9 | * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de) | |
10 | * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl) | |
11 | * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) | |
12 | */ | |
4fc268d2 | 13 | #include <linux/capability.h> |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/errno.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/socket.h> | |
18 | #include <linux/in.h> | |
19 | #include <linux/kernel.h> | |
3f07c014 | 20 | #include <linux/sched/signal.h> |
1da177e4 LT |
21 | #include <linux/timer.h> |
22 | #include <linux/string.h> | |
1da177e4 LT |
23 | #include <linux/sockios.h> |
24 | #include <linux/net.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
1da177e4 LT |
26 | #include <net/ax25.h> |
27 | #include <linux/inet.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/skbuff.h> | |
31 | #include <net/sock.h> | |
7c0f6ba6 | 32 | #include <linux/uaccess.h> |
1da177e4 LT |
33 | #include <linux/fcntl.h> |
34 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ | |
35 | #include <linux/mm.h> | |
36 | #include <linux/interrupt.h> | |
37 | #include <linux/notifier.h> | |
38 | #include <linux/proc_fs.h> | |
39 | #include <linux/stat.h> | |
1da177e4 LT |
40 | #include <linux/sysctl.h> |
41 | #include <linux/init.h> | |
42 | #include <linux/spinlock.h> | |
457c4cbc | 43 | #include <net/net_namespace.h> |
c752f073 | 44 | #include <net/tcp_states.h> |
1da177e4 LT |
45 | #include <net/ip.h> |
46 | #include <net/arp.h> | |
47 | ||
48 | ||
49 | ||
50 | HLIST_HEAD(ax25_list); | |
51 | DEFINE_SPINLOCK(ax25_list_lock); | |
52 | ||
90ddc4f0 | 53 | static const struct proto_ops ax25_proto_ops; |
1da177e4 LT |
54 | |
55 | static void ax25_free_sock(struct sock *sk) | |
56 | { | |
3200392b | 57 | ax25_cb_put(sk_to_ax25(sk)); |
1da177e4 LT |
58 | } |
59 | ||
60 | /* | |
61 | * Socket removal during an interrupt is now safe. | |
62 | */ | |
63 | static void ax25_cb_del(ax25_cb *ax25) | |
64 | { | |
65 | if (!hlist_unhashed(&ax25->ax25_node)) { | |
66 | spin_lock_bh(&ax25_list_lock); | |
67 | hlist_del_init(&ax25->ax25_node); | |
68 | spin_unlock_bh(&ax25_list_lock); | |
69 | ax25_cb_put(ax25); | |
70 | } | |
71 | } | |
72 | ||
73 | /* | |
74 | * Kill all bound sockets on a dropped device. | |
75 | */ | |
76 | static void ax25_kill_by_device(struct net_device *dev) | |
77 | { | |
78 | ax25_dev *ax25_dev; | |
79 | ax25_cb *s; | |
1da177e4 LT |
80 | |
81 | if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) | |
82 | return; | |
83 | ||
84 | spin_lock_bh(&ax25_list_lock); | |
ecd2ebde | 85 | again: |
b67bfe0d | 86 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
87 | if (s->ax25_dev == ax25_dev) { |
88 | s->ax25_dev = NULL; | |
ecd2ebde | 89 | spin_unlock_bh(&ax25_list_lock); |
1da177e4 | 90 | ax25_disconnect(s, ENETUNREACH); |
ecd2ebde JP |
91 | spin_lock_bh(&ax25_list_lock); |
92 | ||
93 | /* The entry could have been deleted from the | |
94 | * list meanwhile and thus the next pointer is | |
95 | * no longer valid. Play it safe and restart | |
96 | * the scan. Forward progress is ensured | |
97 | * because we set s->ax25_dev to NULL and we | |
98 | * are never passed a NULL 'dev' argument. | |
99 | */ | |
100 | goto again; | |
1da177e4 LT |
101 | } |
102 | } | |
103 | spin_unlock_bh(&ax25_list_lock); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Handle device status changes. | |
108 | */ | |
109 | static int ax25_device_event(struct notifier_block *this, unsigned long event, | |
351638e7 | 110 | void *ptr) |
1da177e4 | 111 | { |
351638e7 | 112 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
1da177e4 | 113 | |
721499e8 | 114 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
115 | return NOTIFY_DONE; |
116 | ||
1da177e4 LT |
117 | /* Reject non AX.25 devices */ |
118 | if (dev->type != ARPHRD_AX25) | |
119 | return NOTIFY_DONE; | |
120 | ||
121 | switch (event) { | |
122 | case NETDEV_UP: | |
123 | ax25_dev_device_up(dev); | |
124 | break; | |
125 | case NETDEV_DOWN: | |
126 | ax25_kill_by_device(dev); | |
127 | ax25_rt_device_down(dev); | |
128 | ax25_dev_device_down(dev); | |
129 | break; | |
130 | default: | |
131 | break; | |
132 | } | |
133 | ||
134 | return NOTIFY_DONE; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Add a socket to the bound sockets list. | |
139 | */ | |
140 | void ax25_cb_add(ax25_cb *ax25) | |
141 | { | |
142 | spin_lock_bh(&ax25_list_lock); | |
143 | ax25_cb_hold(ax25); | |
144 | hlist_add_head(&ax25->ax25_node, &ax25_list); | |
145 | spin_unlock_bh(&ax25_list_lock); | |
146 | } | |
147 | ||
148 | /* | |
149 | * Find a socket that wants to accept the SABM we have just | |
150 | * received. | |
151 | */ | |
152 | struct sock *ax25_find_listener(ax25_address *addr, int digi, | |
153 | struct net_device *dev, int type) | |
154 | { | |
155 | ax25_cb *s; | |
1da177e4 | 156 | |
c19c4b9c | 157 | spin_lock(&ax25_list_lock); |
b67bfe0d | 158 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
159 | if ((s->iamdigi && !digi) || (!s->iamdigi && digi)) |
160 | continue; | |
161 | if (s->sk && !ax25cmp(&s->source_addr, addr) && | |
162 | s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) { | |
163 | /* If device is null we match any device */ | |
164 | if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) { | |
165 | sock_hold(s->sk); | |
c19c4b9c | 166 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
167 | return s->sk; |
168 | } | |
169 | } | |
170 | } | |
c19c4b9c | 171 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
172 | |
173 | return NULL; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Find an AX.25 socket given both ends. | |
178 | */ | |
179 | struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr, | |
180 | int type) | |
181 | { | |
182 | struct sock *sk = NULL; | |
183 | ax25_cb *s; | |
1da177e4 | 184 | |
c19c4b9c | 185 | spin_lock(&ax25_list_lock); |
b67bfe0d | 186 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
187 | if (s->sk && !ax25cmp(&s->source_addr, my_addr) && |
188 | !ax25cmp(&s->dest_addr, dest_addr) && | |
189 | s->sk->sk_type == type) { | |
190 | sk = s->sk; | |
191 | sock_hold(sk); | |
192 | break; | |
193 | } | |
194 | } | |
195 | ||
c19c4b9c | 196 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
197 | |
198 | return sk; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Find an AX.25 control block given both ends. It will only pick up | |
203 | * floating AX.25 control blocks or non Raw socket bound control blocks. | |
204 | */ | |
205 | ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr, | |
206 | ax25_digi *digi, struct net_device *dev) | |
207 | { | |
208 | ax25_cb *s; | |
1da177e4 LT |
209 | |
210 | spin_lock_bh(&ax25_list_lock); | |
b67bfe0d | 211 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
212 | if (s->sk && s->sk->sk_type != SOCK_SEQPACKET) |
213 | continue; | |
214 | if (s->ax25_dev == NULL) | |
215 | continue; | |
216 | if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) { | |
217 | if (digi != NULL && digi->ndigi != 0) { | |
218 | if (s->digipeat == NULL) | |
219 | continue; | |
220 | if (ax25digicmp(s->digipeat, digi) != 0) | |
221 | continue; | |
222 | } else { | |
223 | if (s->digipeat != NULL && s->digipeat->ndigi != 0) | |
224 | continue; | |
225 | } | |
226 | ax25_cb_hold(s); | |
227 | spin_unlock_bh(&ax25_list_lock); | |
228 | ||
229 | return s; | |
230 | } | |
231 | } | |
232 | spin_unlock_bh(&ax25_list_lock); | |
233 | ||
234 | return NULL; | |
235 | } | |
236 | ||
70868eac RB |
237 | EXPORT_SYMBOL(ax25_find_cb); |
238 | ||
1da177e4 LT |
239 | void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto) |
240 | { | |
241 | ax25_cb *s; | |
242 | struct sk_buff *copy; | |
1da177e4 | 243 | |
c19c4b9c | 244 | spin_lock(&ax25_list_lock); |
b67bfe0d | 245 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
246 | if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && |
247 | s->sk->sk_type == SOCK_RAW && | |
248 | s->sk->sk_protocol == proto && | |
249 | s->ax25_dev->dev == skb->dev && | |
250 | atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) { | |
251 | if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL) | |
252 | continue; | |
253 | if (sock_queue_rcv_skb(s->sk, copy) != 0) | |
254 | kfree_skb(copy); | |
255 | } | |
256 | } | |
c19c4b9c | 257 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
258 | } |
259 | ||
260 | /* | |
261 | * Deferred destroy. | |
262 | */ | |
263 | void ax25_destroy_socket(ax25_cb *); | |
264 | ||
265 | /* | |
266 | * Handler for deferred kills. | |
267 | */ | |
8dbd05ff | 268 | static void ax25_destroy_timer(struct timer_list *t) |
1da177e4 | 269 | { |
8dbd05ff | 270 | ax25_cb *ax25 = from_timer(ax25, t, dtimer); |
1da177e4 | 271 | struct sock *sk; |
528930b9 | 272 | |
1da177e4 | 273 | sk=ax25->sk; |
528930b9 | 274 | |
1da177e4 LT |
275 | bh_lock_sock(sk); |
276 | sock_hold(sk); | |
277 | ax25_destroy_socket(ax25); | |
278 | bh_unlock_sock(sk); | |
279 | sock_put(sk); | |
280 | } | |
281 | ||
282 | /* | |
283 | * This is called from user mode and the timers. Thus it protects itself | |
284 | * against interrupt users but doesn't worry about being called during | |
285 | * work. Once it is removed from the queue no interrupt or bottom half | |
286 | * will touch it and we are (fairly 8-) ) safe. | |
287 | */ | |
288 | void ax25_destroy_socket(ax25_cb *ax25) | |
289 | { | |
290 | struct sk_buff *skb; | |
291 | ||
292 | ax25_cb_del(ax25); | |
293 | ||
294 | ax25_stop_heartbeat(ax25); | |
295 | ax25_stop_t1timer(ax25); | |
296 | ax25_stop_t2timer(ax25); | |
297 | ax25_stop_t3timer(ax25); | |
298 | ax25_stop_idletimer(ax25); | |
299 | ||
300 | ax25_clear_queues(ax25); /* Flush the queues */ | |
301 | ||
302 | if (ax25->sk != NULL) { | |
303 | while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) { | |
304 | if (skb->sk != ax25->sk) { | |
305 | /* A pending connection */ | |
3200392b | 306 | ax25_cb *sax25 = sk_to_ax25(skb->sk); |
1da177e4 LT |
307 | |
308 | /* Queue the unaccepted socket for death */ | |
309 | sock_orphan(skb->sk); | |
310 | ||
33d1d2c5 DM |
311 | /* 9A4GL: hack to release unaccepted sockets */ |
312 | skb->sk->sk_state = TCP_LISTEN; | |
313 | ||
1da177e4 LT |
314 | ax25_start_heartbeat(sax25); |
315 | sax25->state = AX25_STATE_0; | |
316 | } | |
317 | ||
318 | kfree_skb(skb); | |
319 | } | |
320 | skb_queue_purge(&ax25->sk->sk_write_queue); | |
321 | } | |
322 | ||
323 | if (ax25->sk != NULL) { | |
c564039f | 324 | if (sk_has_allocations(ax25->sk)) { |
1da177e4 | 325 | /* Defer: outstanding buffers */ |
8dbd05ff | 326 | timer_setup(&ax25->dtimer, ax25_destroy_timer, 0); |
1da177e4 | 327 | ax25->dtimer.expires = jiffies + 2 * HZ; |
1da177e4 LT |
328 | add_timer(&ax25->dtimer); |
329 | } else { | |
330 | struct sock *sk=ax25->sk; | |
331 | ax25->sk=NULL; | |
332 | sock_put(sk); | |
333 | } | |
334 | } else { | |
335 | ax25_cb_put(ax25); | |
336 | } | |
337 | } | |
338 | ||
339 | /* | |
340 | * dl1bke 960311: set parameters for existing AX.25 connections, | |
341 | * includes a KILL command to abort any connection. | |
342 | * VERY useful for debugging ;-) | |
343 | */ | |
344 | static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg) | |
345 | { | |
346 | struct ax25_ctl_struct ax25_ctl; | |
347 | ax25_digi digi; | |
348 | ax25_dev *ax25_dev; | |
349 | ax25_cb *ax25; | |
350 | unsigned int k; | |
c0181d42 | 351 | int ret = 0; |
1da177e4 LT |
352 | |
353 | if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl))) | |
354 | return -EFAULT; | |
355 | ||
356 | if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL) | |
357 | return -ENODEV; | |
358 | ||
359 | if (ax25_ctl.digi_count > AX25_MAX_DIGIS) | |
360 | return -EINVAL; | |
361 | ||
43ab8502 | 362 | if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL) |
363 | return -EINVAL; | |
364 | ||
1da177e4 LT |
365 | digi.ndigi = ax25_ctl.digi_count; |
366 | for (k = 0; k < digi.ndigi; k++) | |
367 | digi.calls[k] = ax25_ctl.digi_addr[k]; | |
368 | ||
369 | if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL) | |
370 | return -ENOTCONN; | |
371 | ||
372 | switch (ax25_ctl.cmd) { | |
373 | case AX25_KILL: | |
374 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
375 | #ifdef CONFIG_AX25_DAMA_SLAVE | |
376 | if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE) | |
377 | ax25_dama_off(ax25); | |
378 | #endif | |
379 | ax25_disconnect(ax25, ENETRESET); | |
380 | break; | |
381 | ||
528930b9 YH |
382 | case AX25_WINDOW: |
383 | if (ax25->modulus == AX25_MODULUS) { | |
384 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7) | |
c0181d42 | 385 | goto einval_put; |
528930b9 YH |
386 | } else { |
387 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63) | |
c0181d42 | 388 | goto einval_put; |
528930b9 YH |
389 | } |
390 | ax25->window = ax25_ctl.arg; | |
391 | break; | |
392 | ||
393 | case AX25_T1: | |
be639ac6 | 394 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) |
c0181d42 | 395 | goto einval_put; |
528930b9 YH |
396 | ax25->rtt = (ax25_ctl.arg * HZ) / 2; |
397 | ax25->t1 = ax25_ctl.arg * HZ; | |
398 | break; | |
399 | ||
400 | case AX25_T2: | |
be639ac6 | 401 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) |
c0181d42 | 402 | goto einval_put; |
528930b9 YH |
403 | ax25->t2 = ax25_ctl.arg * HZ; |
404 | break; | |
405 | ||
406 | case AX25_N2: | |
407 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31) | |
c0181d42 | 408 | goto einval_put; |
528930b9 YH |
409 | ax25->n2count = 0; |
410 | ax25->n2 = ax25_ctl.arg; | |
411 | break; | |
412 | ||
413 | case AX25_T3: | |
be639ac6 RB |
414 | if (ax25_ctl.arg > ULONG_MAX / HZ) |
415 | goto einval_put; | |
528930b9 YH |
416 | ax25->t3 = ax25_ctl.arg * HZ; |
417 | break; | |
418 | ||
419 | case AX25_IDLE: | |
be639ac6 RB |
420 | if (ax25_ctl.arg > ULONG_MAX / (60 * HZ)) |
421 | goto einval_put; | |
422 | ||
528930b9 YH |
423 | ax25->idle = ax25_ctl.arg * 60 * HZ; |
424 | break; | |
425 | ||
426 | case AX25_PACLEN: | |
427 | if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535) | |
c0181d42 | 428 | goto einval_put; |
528930b9 YH |
429 | ax25->paclen = ax25_ctl.arg; |
430 | break; | |
431 | ||
432 | default: | |
c0181d42 | 433 | goto einval_put; |
1da177e4 LT |
434 | } |
435 | ||
c0181d42 JP |
436 | out_put: |
437 | ax25_cb_put(ax25); | |
438 | return ret; | |
439 | ||
440 | einval_put: | |
441 | ret = -EINVAL; | |
442 | goto out_put; | |
1da177e4 LT |
443 | } |
444 | ||
e1fdb5b3 RB |
445 | static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev) |
446 | { | |
447 | ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2; | |
448 | ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]); | |
449 | ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]); | |
450 | ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]); | |
451 | ax25->n2 = ax25_dev->values[AX25_VALUES_N2]; | |
452 | ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN]; | |
453 | ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]); | |
454 | ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF]; | |
455 | ||
456 | if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) { | |
457 | ax25->modulus = AX25_EMODULUS; | |
458 | ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW]; | |
459 | } else { | |
460 | ax25->modulus = AX25_MODULUS; | |
461 | ax25->window = ax25_dev->values[AX25_VALUES_WINDOW]; | |
462 | } | |
463 | } | |
464 | ||
1da177e4 LT |
465 | /* |
466 | * Fill in a created AX.25 created control block with the default | |
467 | * values for a particular device. | |
468 | */ | |
469 | void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev) | |
470 | { | |
471 | ax25->ax25_dev = ax25_dev; | |
472 | ||
473 | if (ax25->ax25_dev != NULL) { | |
e1fdb5b3 RB |
474 | ax25_fillin_cb_from_dev(ax25, ax25_dev); |
475 | return; | |
476 | } | |
477 | ||
478 | /* | |
479 | * No device, use kernel / AX.25 spec default values | |
480 | */ | |
481 | ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2; | |
482 | ax25->t1 = msecs_to_jiffies(AX25_DEF_T1); | |
483 | ax25->t2 = msecs_to_jiffies(AX25_DEF_T2); | |
484 | ax25->t3 = msecs_to_jiffies(AX25_DEF_T3); | |
485 | ax25->n2 = AX25_DEF_N2; | |
486 | ax25->paclen = AX25_DEF_PACLEN; | |
487 | ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE); | |
488 | ax25->backoff = AX25_DEF_BACKOFF; | |
489 | ||
490 | if (AX25_DEF_AXDEFMODE) { | |
491 | ax25->modulus = AX25_EMODULUS; | |
492 | ax25->window = AX25_DEF_EWINDOW; | |
1da177e4 | 493 | } else { |
e1fdb5b3 RB |
494 | ax25->modulus = AX25_MODULUS; |
495 | ax25->window = AX25_DEF_WINDOW; | |
1da177e4 LT |
496 | } |
497 | } | |
498 | ||
499 | /* | |
500 | * Create an empty AX.25 control block. | |
501 | */ | |
502 | ax25_cb *ax25_create_cb(void) | |
503 | { | |
504 | ax25_cb *ax25; | |
505 | ||
1b30dd35 | 506 | if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL) |
1da177e4 LT |
507 | return NULL; |
508 | ||
b6d52ede | 509 | refcount_set(&ax25->refcount, 1); |
1da177e4 LT |
510 | |
511 | skb_queue_head_init(&ax25->write_queue); | |
512 | skb_queue_head_init(&ax25->frag_queue); | |
513 | skb_queue_head_init(&ax25->ack_queue); | |
514 | skb_queue_head_init(&ax25->reseq_queue); | |
515 | ||
21fab4a8 | 516 | ax25_setup_timers(ax25); |
1da177e4 LT |
517 | |
518 | ax25_fillin_cb(ax25, NULL); | |
519 | ||
520 | ax25->state = AX25_STATE_0; | |
521 | ||
522 | return ax25; | |
523 | } | |
524 | ||
525 | /* | |
526 | * Handling for system calls applied via the various interfaces to an | |
527 | * AX25 socket object | |
528 | */ | |
529 | ||
530 | static int ax25_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 531 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
532 | { |
533 | struct sock *sk = sock->sk; | |
534 | ax25_cb *ax25; | |
535 | struct net_device *dev; | |
536 | char devname[IFNAMSIZ]; | |
ba1cffe0 XW |
537 | unsigned long opt; |
538 | int res = 0; | |
1da177e4 LT |
539 | |
540 | if (level != SOL_AX25) | |
541 | return -ENOPROTOOPT; | |
542 | ||
ba1cffe0 | 543 | if (optlen < sizeof(unsigned int)) |
1da177e4 LT |
544 | return -EINVAL; |
545 | ||
ba1cffe0 | 546 | if (get_user(opt, (unsigned int __user *)optval)) |
1da177e4 LT |
547 | return -EFAULT; |
548 | ||
549 | lock_sock(sk); | |
3200392b | 550 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
551 | |
552 | switch (optname) { | |
553 | case AX25_WINDOW: | |
554 | if (ax25->modulus == AX25_MODULUS) { | |
555 | if (opt < 1 || opt > 7) { | |
556 | res = -EINVAL; | |
557 | break; | |
558 | } | |
559 | } else { | |
560 | if (opt < 1 || opt > 63) { | |
561 | res = -EINVAL; | |
562 | break; | |
563 | } | |
564 | } | |
565 | ax25->window = opt; | |
566 | break; | |
567 | ||
568 | case AX25_T1: | |
be639ac6 | 569 | if (opt < 1 || opt > ULONG_MAX / HZ) { |
1da177e4 LT |
570 | res = -EINVAL; |
571 | break; | |
572 | } | |
f16f3026 | 573 | ax25->rtt = (opt * HZ) >> 1; |
1da177e4 LT |
574 | ax25->t1 = opt * HZ; |
575 | break; | |
576 | ||
577 | case AX25_T2: | |
be639ac6 | 578 | if (opt < 1 || opt > ULONG_MAX / HZ) { |
1da177e4 LT |
579 | res = -EINVAL; |
580 | break; | |
581 | } | |
582 | ax25->t2 = opt * HZ; | |
583 | break; | |
584 | ||
585 | case AX25_N2: | |
586 | if (opt < 1 || opt > 31) { | |
587 | res = -EINVAL; | |
588 | break; | |
589 | } | |
590 | ax25->n2 = opt; | |
591 | break; | |
592 | ||
593 | case AX25_T3: | |
be639ac6 | 594 | if (opt < 1 || opt > ULONG_MAX / HZ) { |
1da177e4 LT |
595 | res = -EINVAL; |
596 | break; | |
597 | } | |
598 | ax25->t3 = opt * HZ; | |
599 | break; | |
600 | ||
601 | case AX25_IDLE: | |
ba1cffe0 | 602 | if (opt > ULONG_MAX / (60 * HZ)) { |
1da177e4 LT |
603 | res = -EINVAL; |
604 | break; | |
605 | } | |
606 | ax25->idle = opt * 60 * HZ; | |
607 | break; | |
608 | ||
609 | case AX25_BACKOFF: | |
ba1cffe0 | 610 | if (opt > 2) { |
1da177e4 LT |
611 | res = -EINVAL; |
612 | break; | |
613 | } | |
614 | ax25->backoff = opt; | |
615 | break; | |
616 | ||
617 | case AX25_EXTSEQ: | |
618 | ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS; | |
619 | break; | |
620 | ||
621 | case AX25_PIDINCL: | |
622 | ax25->pidincl = opt ? 1 : 0; | |
623 | break; | |
624 | ||
625 | case AX25_IAMDIGI: | |
626 | ax25->iamdigi = opt ? 1 : 0; | |
627 | break; | |
628 | ||
629 | case AX25_PACLEN: | |
630 | if (opt < 16 || opt > 65535) { | |
631 | res = -EINVAL; | |
632 | break; | |
633 | } | |
634 | ax25->paclen = opt; | |
635 | break; | |
636 | ||
637 | case SO_BINDTODEVICE: | |
638 | if (optlen > IFNAMSIZ) | |
2f72291d | 639 | optlen = IFNAMSIZ; |
1da177e4 | 640 | |
2f72291d RB |
641 | if (copy_from_user(devname, optval, optlen)) { |
642 | res = -EFAULT; | |
1da177e4 LT |
643 | break; |
644 | } | |
645 | ||
646 | if (sk->sk_type == SOCK_SEQPACKET && | |
647 | (sock->state != SS_UNCONNECTED || | |
648 | sk->sk_state == TCP_LISTEN)) { | |
649 | res = -EADDRNOTAVAIL; | |
2f72291d RB |
650 | break; |
651 | } | |
652 | ||
c4335704 CW |
653 | rtnl_lock(); |
654 | dev = __dev_get_by_name(&init_net, devname); | |
2f72291d | 655 | if (!dev) { |
c4335704 | 656 | rtnl_unlock(); |
2f72291d | 657 | res = -ENODEV; |
1da177e4 LT |
658 | break; |
659 | } | |
660 | ||
661 | ax25->ax25_dev = ax25_dev_ax25dev(dev); | |
c4335704 CW |
662 | if (!ax25->ax25_dev) { |
663 | rtnl_unlock(); | |
664 | res = -ENODEV; | |
665 | break; | |
666 | } | |
1da177e4 | 667 | ax25_fillin_cb(ax25, ax25->ax25_dev); |
c4335704 | 668 | rtnl_unlock(); |
1da177e4 LT |
669 | break; |
670 | ||
671 | default: | |
672 | res = -ENOPROTOOPT; | |
673 | } | |
674 | release_sock(sk); | |
675 | ||
676 | return res; | |
677 | } | |
678 | ||
679 | static int ax25_getsockopt(struct socket *sock, int level, int optname, | |
680 | char __user *optval, int __user *optlen) | |
681 | { | |
682 | struct sock *sk = sock->sk; | |
683 | ax25_cb *ax25; | |
684 | struct ax25_dev *ax25_dev; | |
685 | char devname[IFNAMSIZ]; | |
686 | void *valptr; | |
687 | int val = 0; | |
688 | int maxlen, length; | |
689 | ||
690 | if (level != SOL_AX25) | |
691 | return -ENOPROTOOPT; | |
692 | ||
693 | if (get_user(maxlen, optlen)) | |
694 | return -EFAULT; | |
695 | ||
696 | if (maxlen < 1) | |
697 | return -EFAULT; | |
698 | ||
699 | valptr = (void *) &val; | |
700 | length = min_t(unsigned int, maxlen, sizeof(int)); | |
701 | ||
702 | lock_sock(sk); | |
3200392b | 703 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
704 | |
705 | switch (optname) { | |
706 | case AX25_WINDOW: | |
707 | val = ax25->window; | |
708 | break; | |
709 | ||
710 | case AX25_T1: | |
711 | val = ax25->t1 / HZ; | |
712 | break; | |
713 | ||
714 | case AX25_T2: | |
715 | val = ax25->t2 / HZ; | |
716 | break; | |
717 | ||
718 | case AX25_N2: | |
719 | val = ax25->n2; | |
720 | break; | |
721 | ||
722 | case AX25_T3: | |
723 | val = ax25->t3 / HZ; | |
724 | break; | |
725 | ||
726 | case AX25_IDLE: | |
727 | val = ax25->idle / (60 * HZ); | |
728 | break; | |
729 | ||
730 | case AX25_BACKOFF: | |
731 | val = ax25->backoff; | |
732 | break; | |
733 | ||
734 | case AX25_EXTSEQ: | |
735 | val = (ax25->modulus == AX25_EMODULUS); | |
736 | break; | |
737 | ||
738 | case AX25_PIDINCL: | |
739 | val = ax25->pidincl; | |
740 | break; | |
741 | ||
742 | case AX25_IAMDIGI: | |
743 | val = ax25->iamdigi; | |
744 | break; | |
745 | ||
746 | case AX25_PACLEN: | |
747 | val = ax25->paclen; | |
748 | break; | |
749 | ||
750 | case SO_BINDTODEVICE: | |
751 | ax25_dev = ax25->ax25_dev; | |
752 | ||
753 | if (ax25_dev != NULL && ax25_dev->dev != NULL) { | |
754 | strlcpy(devname, ax25_dev->dev->name, sizeof(devname)); | |
755 | length = strlen(devname) + 1; | |
756 | } else { | |
757 | *devname = '\0'; | |
758 | length = 1; | |
759 | } | |
760 | ||
761 | valptr = (void *) devname; | |
762 | break; | |
763 | ||
764 | default: | |
765 | release_sock(sk); | |
766 | return -ENOPROTOOPT; | |
767 | } | |
768 | release_sock(sk); | |
769 | ||
770 | if (put_user(length, optlen)) | |
771 | return -EFAULT; | |
772 | ||
773 | return copy_to_user(optval, valptr, length) ? -EFAULT : 0; | |
774 | } | |
775 | ||
776 | static int ax25_listen(struct socket *sock, int backlog) | |
777 | { | |
778 | struct sock *sk = sock->sk; | |
779 | int res = 0; | |
780 | ||
781 | lock_sock(sk); | |
782 | if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) { | |
783 | sk->sk_max_ack_backlog = backlog; | |
784 | sk->sk_state = TCP_LISTEN; | |
785 | goto out; | |
786 | } | |
787 | res = -EOPNOTSUPP; | |
788 | ||
789 | out: | |
790 | release_sock(sk); | |
791 | ||
792 | return res; | |
793 | } | |
794 | ||
795 | /* | |
796 | * XXX: when creating ax25_sock we should update the .obj_size setting | |
797 | * below. | |
798 | */ | |
799 | static struct proto ax25_proto = { | |
800 | .name = "AX25", | |
801 | .owner = THIS_MODULE, | |
3200392b | 802 | .obj_size = sizeof(struct ax25_sock), |
1da177e4 LT |
803 | }; |
804 | ||
3f378b68 EP |
805 | static int ax25_create(struct net *net, struct socket *sock, int protocol, |
806 | int kern) | |
1da177e4 LT |
807 | { |
808 | struct sock *sk; | |
809 | ax25_cb *ax25; | |
810 | ||
79462ad0 HFS |
811 | if (protocol < 0 || protocol > SK_PROTOCOL_MAX) |
812 | return -EINVAL; | |
813 | ||
09ad9bc7 | 814 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
815 | return -EAFNOSUPPORT; |
816 | ||
1da177e4 LT |
817 | switch (sock->type) { |
818 | case SOCK_DGRAM: | |
819 | if (protocol == 0 || protocol == PF_AX25) | |
820 | protocol = AX25_P_TEXT; | |
821 | break; | |
822 | ||
823 | case SOCK_SEQPACKET: | |
824 | switch (protocol) { | |
825 | case 0: | |
826 | case PF_AX25: /* For CLX */ | |
827 | protocol = AX25_P_TEXT; | |
828 | break; | |
829 | case AX25_P_SEGMENT: | |
830 | #ifdef CONFIG_INET | |
831 | case AX25_P_ARP: | |
832 | case AX25_P_IP: | |
833 | #endif | |
834 | #ifdef CONFIG_NETROM | |
835 | case AX25_P_NETROM: | |
836 | #endif | |
837 | #ifdef CONFIG_ROSE | |
838 | case AX25_P_ROSE: | |
839 | #endif | |
840 | return -ESOCKTNOSUPPORT; | |
841 | #ifdef CONFIG_NETROM_MODULE | |
842 | case AX25_P_NETROM: | |
843 | if (ax25_protocol_is_registered(AX25_P_NETROM)) | |
844 | return -ESOCKTNOSUPPORT; | |
ef764a13 | 845 | break; |
1da177e4 LT |
846 | #endif |
847 | #ifdef CONFIG_ROSE_MODULE | |
848 | case AX25_P_ROSE: | |
849 | if (ax25_protocol_is_registered(AX25_P_ROSE)) | |
850 | return -ESOCKTNOSUPPORT; | |
851 | #endif | |
852 | default: | |
853 | break; | |
854 | } | |
855 | break; | |
856 | ||
857 | case SOCK_RAW: | |
858 | break; | |
859 | default: | |
860 | return -ESOCKTNOSUPPORT; | |
861 | } | |
862 | ||
11aa9c28 | 863 | sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern); |
6257ff21 | 864 | if (sk == NULL) |
1da177e4 LT |
865 | return -ENOMEM; |
866 | ||
3200392b | 867 | ax25 = ax25_sk(sk)->cb = ax25_create_cb(); |
1da177e4 LT |
868 | if (!ax25) { |
869 | sk_free(sk); | |
870 | return -ENOMEM; | |
871 | } | |
872 | ||
873 | sock_init_data(sock, sk); | |
874 | ||
875 | sk->sk_destruct = ax25_free_sock; | |
876 | sock->ops = &ax25_proto_ops; | |
877 | sk->sk_protocol = protocol; | |
878 | ||
879 | ax25->sk = sk; | |
880 | ||
881 | return 0; | |
882 | } | |
883 | ||
884 | struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev) | |
885 | { | |
886 | struct sock *sk; | |
887 | ax25_cb *ax25, *oax25; | |
888 | ||
11aa9c28 | 889 | sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0); |
6257ff21 | 890 | if (sk == NULL) |
1da177e4 LT |
891 | return NULL; |
892 | ||
893 | if ((ax25 = ax25_create_cb()) == NULL) { | |
894 | sk_free(sk); | |
895 | return NULL; | |
896 | } | |
897 | ||
898 | switch (osk->sk_type) { | |
899 | case SOCK_DGRAM: | |
900 | break; | |
901 | case SOCK_SEQPACKET: | |
902 | break; | |
903 | default: | |
904 | sk_free(sk); | |
905 | ax25_cb_put(ax25); | |
906 | return NULL; | |
907 | } | |
908 | ||
909 | sock_init_data(NULL, sk); | |
910 | ||
1da177e4 | 911 | sk->sk_type = osk->sk_type; |
1da177e4 LT |
912 | sk->sk_priority = osk->sk_priority; |
913 | sk->sk_protocol = osk->sk_protocol; | |
914 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
915 | sk->sk_sndbuf = osk->sk_sndbuf; | |
916 | sk->sk_state = TCP_ESTABLISHED; | |
53b924b3 | 917 | sock_copy_flags(sk, osk); |
1da177e4 | 918 | |
3200392b | 919 | oax25 = sk_to_ax25(osk); |
1da177e4 LT |
920 | |
921 | ax25->modulus = oax25->modulus; | |
922 | ax25->backoff = oax25->backoff; | |
923 | ax25->pidincl = oax25->pidincl; | |
924 | ax25->iamdigi = oax25->iamdigi; | |
925 | ax25->rtt = oax25->rtt; | |
926 | ax25->t1 = oax25->t1; | |
927 | ax25->t2 = oax25->t2; | |
928 | ax25->t3 = oax25->t3; | |
929 | ax25->n2 = oax25->n2; | |
930 | ax25->idle = oax25->idle; | |
931 | ax25->paclen = oax25->paclen; | |
932 | ax25->window = oax25->window; | |
933 | ||
934 | ax25->ax25_dev = ax25_dev; | |
935 | ax25->source_addr = oax25->source_addr; | |
936 | ||
937 | if (oax25->digipeat != NULL) { | |
0459d70a ACM |
938 | ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi), |
939 | GFP_ATOMIC); | |
940 | if (ax25->digipeat == NULL) { | |
1da177e4 LT |
941 | sk_free(sk); |
942 | ax25_cb_put(ax25); | |
943 | return NULL; | |
944 | } | |
1da177e4 LT |
945 | } |
946 | ||
3200392b | 947 | ax25_sk(sk)->cb = ax25; |
8c185ab6 | 948 | sk->sk_destruct = ax25_free_sock; |
1da177e4 LT |
949 | ax25->sk = sk; |
950 | ||
951 | return sk; | |
952 | } | |
953 | ||
954 | static int ax25_release(struct socket *sock) | |
955 | { | |
956 | struct sock *sk = sock->sk; | |
957 | ax25_cb *ax25; | |
958 | ||
959 | if (sk == NULL) | |
960 | return 0; | |
961 | ||
962 | sock_hold(sk); | |
963 | sock_orphan(sk); | |
964 | lock_sock(sk); | |
3200392b | 965 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
966 | |
967 | if (sk->sk_type == SOCK_SEQPACKET) { | |
968 | switch (ax25->state) { | |
969 | case AX25_STATE_0: | |
970 | release_sock(sk); | |
971 | ax25_disconnect(ax25, 0); | |
972 | lock_sock(sk); | |
973 | ax25_destroy_socket(ax25); | |
974 | break; | |
975 | ||
976 | case AX25_STATE_1: | |
977 | case AX25_STATE_2: | |
978 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
979 | release_sock(sk); | |
980 | ax25_disconnect(ax25, 0); | |
981 | lock_sock(sk); | |
4a7d99ea BG |
982 | if (!sock_flag(ax25->sk, SOCK_DESTROY)) |
983 | ax25_destroy_socket(ax25); | |
1da177e4 LT |
984 | break; |
985 | ||
986 | case AX25_STATE_3: | |
987 | case AX25_STATE_4: | |
988 | ax25_clear_queues(ax25); | |
989 | ax25->n2count = 0; | |
990 | ||
991 | switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { | |
992 | case AX25_PROTO_STD_SIMPLEX: | |
993 | case AX25_PROTO_STD_DUPLEX: | |
994 | ax25_send_control(ax25, | |
995 | AX25_DISC, | |
996 | AX25_POLLON, | |
997 | AX25_COMMAND); | |
998 | ax25_stop_t2timer(ax25); | |
999 | ax25_stop_t3timer(ax25); | |
1000 | ax25_stop_idletimer(ax25); | |
1001 | break; | |
1002 | #ifdef CONFIG_AX25_DAMA_SLAVE | |
1003 | case AX25_PROTO_DAMA_SLAVE: | |
1004 | ax25_stop_t3timer(ax25); | |
1005 | ax25_stop_idletimer(ax25); | |
1006 | break; | |
1007 | #endif | |
1008 | } | |
1009 | ax25_calculate_t1(ax25); | |
1010 | ax25_start_t1timer(ax25); | |
1011 | ax25->state = AX25_STATE_2; | |
1012 | sk->sk_state = TCP_CLOSE; | |
1013 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1014 | sk->sk_state_change(sk); | |
1015 | sock_set_flag(sk, SOCK_DESTROY); | |
1016 | break; | |
1017 | ||
1018 | default: | |
1019 | break; | |
1020 | } | |
1021 | } else { | |
1022 | sk->sk_state = TCP_CLOSE; | |
1023 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1024 | sk->sk_state_change(sk); | |
1025 | ax25_destroy_socket(ax25); | |
1026 | } | |
1027 | ||
1028 | sock->sk = NULL; | |
1029 | release_sock(sk); | |
1030 | sock_put(sk); | |
1031 | ||
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * We support a funny extension here so you can (as root) give any callsign | |
1037 | * digipeated via a local address as source. This hack is obsolete now | |
1038 | * that we've implemented support for SO_BINDTODEVICE. It is however small | |
1039 | * and trivially backward compatible. | |
1040 | */ | |
1041 | static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1042 | { | |
1043 | struct sock *sk = sock->sk; | |
1044 | struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; | |
1045 | ax25_dev *ax25_dev = NULL; | |
01d7dd0e RB |
1046 | ax25_uid_assoc *user; |
1047 | ax25_address call; | |
1da177e4 LT |
1048 | ax25_cb *ax25; |
1049 | int err = 0; | |
1050 | ||
1051 | if (addr_len != sizeof(struct sockaddr_ax25) && | |
1987e7b4 | 1052 | addr_len != sizeof(struct full_sockaddr_ax25)) |
1053 | /* support for old structure may go away some time | |
1054 | * ax25_bind(): uses old (6 digipeater) socket structure. | |
1055 | */ | |
1da177e4 | 1056 | if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || |
1987e7b4 | 1057 | (addr_len > sizeof(struct full_sockaddr_ax25))) |
1da177e4 | 1058 | return -EINVAL; |
1da177e4 LT |
1059 | |
1060 | if (addr->fsa_ax25.sax25_family != AF_AX25) | |
1061 | return -EINVAL; | |
1062 | ||
73400407 | 1063 | user = ax25_findbyuid(current_euid()); |
01d7dd0e RB |
1064 | if (user) { |
1065 | call = user->call; | |
1066 | ax25_uid_put(user); | |
1067 | } else { | |
1068 | if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) | |
1069 | return -EACCES; | |
1070 | ||
1071 | call = addr->fsa_ax25.sax25_call; | |
1da177e4 LT |
1072 | } |
1073 | ||
1074 | lock_sock(sk); | |
1075 | ||
3200392b | 1076 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
1077 | if (!sock_flag(sk, SOCK_ZAPPED)) { |
1078 | err = -EINVAL; | |
1079 | goto out; | |
1080 | } | |
1081 | ||
01d7dd0e | 1082 | ax25->source_addr = call; |
1da177e4 LT |
1083 | |
1084 | /* | |
1085 | * User already set interface with SO_BINDTODEVICE | |
1086 | */ | |
1087 | if (ax25->ax25_dev != NULL) | |
1088 | goto done; | |
1089 | ||
1090 | if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) { | |
1091 | if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 && | |
1092 | (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) { | |
1093 | err = -EADDRNOTAVAIL; | |
1094 | goto out; | |
1095 | } | |
1096 | } else { | |
1097 | if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) { | |
1098 | err = -EADDRNOTAVAIL; | |
1099 | goto out; | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | if (ax25_dev != NULL) | |
1104 | ax25_fillin_cb(ax25, ax25_dev); | |
1105 | ||
1106 | done: | |
1107 | ax25_cb_add(ax25); | |
1108 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1109 | ||
1110 | out: | |
1111 | release_sock(sk); | |
1112 | ||
49339cca | 1113 | return err; |
1da177e4 LT |
1114 | } |
1115 | ||
1116 | /* | |
1117 | * FIXME: nonblock behaviour looks like it may have a bug. | |
1118 | */ | |
c9266b99 RB |
1119 | static int __must_check ax25_connect(struct socket *sock, |
1120 | struct sockaddr *uaddr, int addr_len, int flags) | |
1da177e4 LT |
1121 | { |
1122 | struct sock *sk = sock->sk; | |
3200392b | 1123 | ax25_cb *ax25 = sk_to_ax25(sk), *ax25t; |
1da177e4 LT |
1124 | struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; |
1125 | ax25_digi *digi = NULL; | |
1126 | int ct = 0, err = 0; | |
1127 | ||
1128 | /* | |
1129 | * some sanity checks. code further down depends on this | |
1130 | */ | |
1131 | ||
27d1cba2 | 1132 | if (addr_len == sizeof(struct sockaddr_ax25)) |
1133 | /* support for this will go away in early 2.5.x | |
1134 | * ax25_connect(): uses obsolete socket structure | |
1135 | */ | |
1136 | ; | |
1137 | else if (addr_len != sizeof(struct full_sockaddr_ax25)) | |
1138 | /* support for old structure may go away some time | |
1139 | * ax25_connect(): uses old (6 digipeater) socket structure. | |
1140 | */ | |
1da177e4 | 1141 | if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || |
27d1cba2 | 1142 | (addr_len > sizeof(struct full_sockaddr_ax25))) |
1da177e4 | 1143 | return -EINVAL; |
1da177e4 | 1144 | |
1da177e4 LT |
1145 | |
1146 | if (fsa->fsa_ax25.sax25_family != AF_AX25) | |
1147 | return -EINVAL; | |
1148 | ||
1149 | lock_sock(sk); | |
1150 | ||
1151 | /* deal with restarts */ | |
1152 | if (sock->state == SS_CONNECTING) { | |
1153 | switch (sk->sk_state) { | |
1154 | case TCP_SYN_SENT: /* still trying */ | |
1155 | err = -EINPROGRESS; | |
75606dc6 | 1156 | goto out_release; |
1da177e4 LT |
1157 | |
1158 | case TCP_ESTABLISHED: /* connection established */ | |
1159 | sock->state = SS_CONNECTED; | |
75606dc6 | 1160 | goto out_release; |
1da177e4 LT |
1161 | |
1162 | case TCP_CLOSE: /* connection refused */ | |
1163 | sock->state = SS_UNCONNECTED; | |
1164 | err = -ECONNREFUSED; | |
75606dc6 | 1165 | goto out_release; |
1da177e4 LT |
1166 | } |
1167 | } | |
1168 | ||
1169 | if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) { | |
1170 | err = -EISCONN; /* No reconnect on a seqpacket socket */ | |
75606dc6 | 1171 | goto out_release; |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | sk->sk_state = TCP_CLOSE; | |
1175 | sock->state = SS_UNCONNECTED; | |
1176 | ||
a51482bd JJ |
1177 | kfree(ax25->digipeat); |
1178 | ax25->digipeat = NULL; | |
1da177e4 LT |
1179 | |
1180 | /* | |
1181 | * Handle digi-peaters to be used. | |
1182 | */ | |
1183 | if (addr_len > sizeof(struct sockaddr_ax25) && | |
1184 | fsa->fsa_ax25.sax25_ndigis != 0) { | |
1185 | /* Valid number of digipeaters ? */ | |
1186 | if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) { | |
1187 | err = -EINVAL; | |
75606dc6 | 1188 | goto out_release; |
1da177e4 LT |
1189 | } |
1190 | ||
1191 | if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) { | |
1192 | err = -ENOBUFS; | |
75606dc6 | 1193 | goto out_release; |
1da177e4 LT |
1194 | } |
1195 | ||
1196 | digi->ndigi = fsa->fsa_ax25.sax25_ndigis; | |
1197 | digi->lastrepeat = -1; | |
1198 | ||
1199 | while (ct < fsa->fsa_ax25.sax25_ndigis) { | |
1200 | if ((fsa->fsa_digipeater[ct].ax25_call[6] & | |
1201 | AX25_HBIT) && ax25->iamdigi) { | |
1202 | digi->repeated[ct] = 1; | |
1203 | digi->lastrepeat = ct; | |
1204 | } else { | |
1205 | digi->repeated[ct] = 0; | |
1206 | } | |
1207 | digi->calls[ct] = fsa->fsa_digipeater[ct]; | |
1208 | ct++; | |
1209 | } | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * Must bind first - autobinding in this may or may not work. If | |
1214 | * the socket is already bound, check to see if the device has | |
1215 | * been filled in, error if it hasn't. | |
1216 | */ | |
1217 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1218 | /* check if we can remove this feature. It is broken. */ | |
1219 | printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n", | |
1220 | current->comm); | |
1221 | if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) { | |
1222 | kfree(digi); | |
75606dc6 | 1223 | goto out_release; |
1da177e4 LT |
1224 | } |
1225 | ||
1226 | ax25_fillin_cb(ax25, ax25->ax25_dev); | |
1227 | ax25_cb_add(ax25); | |
1228 | } else { | |
1229 | if (ax25->ax25_dev == NULL) { | |
1230 | kfree(digi); | |
1231 | err = -EHOSTUNREACH; | |
75606dc6 | 1232 | goto out_release; |
1da177e4 LT |
1233 | } |
1234 | } | |
1235 | ||
1236 | if (sk->sk_type == SOCK_SEQPACKET && | |
1237 | (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi, | |
528930b9 | 1238 | ax25->ax25_dev->dev))) { |
1da177e4 LT |
1239 | kfree(digi); |
1240 | err = -EADDRINUSE; /* Already such a connection */ | |
1241 | ax25_cb_put(ax25t); | |
75606dc6 | 1242 | goto out_release; |
1da177e4 LT |
1243 | } |
1244 | ||
1245 | ax25->dest_addr = fsa->fsa_ax25.sax25_call; | |
1246 | ax25->digipeat = digi; | |
1247 | ||
1248 | /* First the easy one */ | |
1249 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1250 | sock->state = SS_CONNECTED; | |
1251 | sk->sk_state = TCP_ESTABLISHED; | |
75606dc6 | 1252 | goto out_release; |
1da177e4 LT |
1253 | } |
1254 | ||
1255 | /* Move to connecting socket, ax.25 lapb WAIT_UA.. */ | |
1256 | sock->state = SS_CONNECTING; | |
1257 | sk->sk_state = TCP_SYN_SENT; | |
1258 | ||
1259 | switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { | |
1260 | case AX25_PROTO_STD_SIMPLEX: | |
1261 | case AX25_PROTO_STD_DUPLEX: | |
1262 | ax25_std_establish_data_link(ax25); | |
1263 | break; | |
1264 | ||
1265 | #ifdef CONFIG_AX25_DAMA_SLAVE | |
1266 | case AX25_PROTO_DAMA_SLAVE: | |
1267 | ax25->modulus = AX25_MODULUS; | |
1268 | ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; | |
1269 | if (ax25->ax25_dev->dama.slave) | |
1270 | ax25_ds_establish_data_link(ax25); | |
1271 | else | |
1272 | ax25_std_establish_data_link(ax25); | |
1273 | break; | |
1274 | #endif | |
1275 | } | |
1276 | ||
1277 | ax25->state = AX25_STATE_1; | |
1278 | ||
1279 | ax25_start_heartbeat(ax25); | |
1280 | ||
1281 | /* Now the loop */ | |
1282 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { | |
1283 | err = -EINPROGRESS; | |
75606dc6 | 1284 | goto out_release; |
1da177e4 LT |
1285 | } |
1286 | ||
1287 | if (sk->sk_state == TCP_SYN_SENT) { | |
75606dc6 | 1288 | DEFINE_WAIT(wait); |
1da177e4 | 1289 | |
1da177e4 | 1290 | for (;;) { |
aa395145 | 1291 | prepare_to_wait(sk_sleep(sk), &wait, |
bd3b071b | 1292 | TASK_INTERRUPTIBLE); |
1da177e4 LT |
1293 | if (sk->sk_state != TCP_SYN_SENT) |
1294 | break; | |
75606dc6 RB |
1295 | if (!signal_pending(current)) { |
1296 | release_sock(sk); | |
1da177e4 LT |
1297 | schedule(); |
1298 | lock_sock(sk); | |
1299 | continue; | |
1300 | } | |
75606dc6 RB |
1301 | err = -ERESTARTSYS; |
1302 | break; | |
1da177e4 | 1303 | } |
aa395145 | 1304 | finish_wait(sk_sleep(sk), &wait); |
75606dc6 RB |
1305 | |
1306 | if (err) | |
1307 | goto out_release; | |
1da177e4 LT |
1308 | } |
1309 | ||
1310 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1311 | /* Not in ABM, not in WAIT_UA -> failed */ | |
1312 | sock->state = SS_UNCONNECTED; | |
1313 | err = sock_error(sk); /* Always set at this point */ | |
75606dc6 | 1314 | goto out_release; |
1da177e4 LT |
1315 | } |
1316 | ||
1317 | sock->state = SS_CONNECTED; | |
1318 | ||
75606dc6 RB |
1319 | err = 0; |
1320 | out_release: | |
1da177e4 LT |
1321 | release_sock(sk); |
1322 | ||
1323 | return err; | |
1324 | } | |
1325 | ||
cdfbabfb DH |
1326 | static int ax25_accept(struct socket *sock, struct socket *newsock, int flags, |
1327 | bool kern) | |
1da177e4 | 1328 | { |
1da177e4 LT |
1329 | struct sk_buff *skb; |
1330 | struct sock *newsk; | |
75606dc6 | 1331 | DEFINE_WAIT(wait); |
1da177e4 LT |
1332 | struct sock *sk; |
1333 | int err = 0; | |
1334 | ||
1335 | if (sock->state != SS_UNCONNECTED) | |
1336 | return -EINVAL; | |
1337 | ||
1338 | if ((sk = sock->sk) == NULL) | |
1339 | return -EINVAL; | |
1340 | ||
1341 | lock_sock(sk); | |
1342 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1343 | err = -EOPNOTSUPP; | |
1344 | goto out; | |
1345 | } | |
1346 | ||
1347 | if (sk->sk_state != TCP_LISTEN) { | |
1348 | err = -EINVAL; | |
1349 | goto out; | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * The read queue this time is holding sockets ready to use | |
1354 | * hooked into the SABM we saved | |
1355 | */ | |
1da177e4 | 1356 | for (;;) { |
aa395145 | 1357 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1358 | skb = skb_dequeue(&sk->sk_receive_queue); |
1359 | if (skb) | |
1360 | break; | |
1361 | ||
1da177e4 | 1362 | if (flags & O_NONBLOCK) { |
75606dc6 RB |
1363 | err = -EWOULDBLOCK; |
1364 | break; | |
1da177e4 | 1365 | } |
75606dc6 RB |
1366 | if (!signal_pending(current)) { |
1367 | release_sock(sk); | |
1da177e4 LT |
1368 | schedule(); |
1369 | lock_sock(sk); | |
1370 | continue; | |
1371 | } | |
75606dc6 RB |
1372 | err = -ERESTARTSYS; |
1373 | break; | |
1da177e4 | 1374 | } |
aa395145 | 1375 | finish_wait(sk_sleep(sk), &wait); |
75606dc6 RB |
1376 | |
1377 | if (err) | |
1378 | goto out; | |
1da177e4 LT |
1379 | |
1380 | newsk = skb->sk; | |
9375cb8a | 1381 | sock_graft(newsk, newsock); |
1da177e4 LT |
1382 | |
1383 | /* Now attach up the new socket */ | |
1384 | kfree_skb(skb); | |
1385 | sk->sk_ack_backlog--; | |
1da177e4 LT |
1386 | newsock->state = SS_CONNECTED; |
1387 | ||
1388 | out: | |
1389 | release_sock(sk); | |
1390 | ||
1391 | return err; | |
1392 | } | |
1393 | ||
1394 | static int ax25_getname(struct socket *sock, struct sockaddr *uaddr, | |
9b2c45d4 | 1395 | int peer) |
1da177e4 LT |
1396 | { |
1397 | struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; | |
1398 | struct sock *sk = sock->sk; | |
1399 | unsigned char ndigi, i; | |
1400 | ax25_cb *ax25; | |
1401 | int err = 0; | |
1402 | ||
5b919f83 | 1403 | memset(fsa, 0, sizeof(*fsa)); |
1da177e4 | 1404 | lock_sock(sk); |
3200392b | 1405 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
1406 | |
1407 | if (peer != 0) { | |
1408 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1409 | err = -ENOTCONN; | |
1410 | goto out; | |
1411 | } | |
1412 | ||
1413 | fsa->fsa_ax25.sax25_family = AF_AX25; | |
1414 | fsa->fsa_ax25.sax25_call = ax25->dest_addr; | |
1da177e4 LT |
1415 | |
1416 | if (ax25->digipeat != NULL) { | |
1417 | ndigi = ax25->digipeat->ndigi; | |
1418 | fsa->fsa_ax25.sax25_ndigis = ndigi; | |
1419 | for (i = 0; i < ndigi; i++) | |
1420 | fsa->fsa_digipeater[i] = | |
1421 | ax25->digipeat->calls[i]; | |
1422 | } | |
1423 | } else { | |
1424 | fsa->fsa_ax25.sax25_family = AF_AX25; | |
1425 | fsa->fsa_ax25.sax25_call = ax25->source_addr; | |
1426 | fsa->fsa_ax25.sax25_ndigis = 1; | |
1427 | if (ax25->ax25_dev != NULL) { | |
1428 | memcpy(&fsa->fsa_digipeater[0], | |
1429 | ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN); | |
1430 | } else { | |
1431 | fsa->fsa_digipeater[0] = null_ax25_address; | |
1432 | } | |
1433 | } | |
9b2c45d4 | 1434 | err = sizeof (struct full_sockaddr_ax25); |
1da177e4 LT |
1435 | |
1436 | out: | |
1437 | release_sock(sk); | |
1438 | ||
1439 | return err; | |
1440 | } | |
1441 | ||
1b784140 | 1442 | static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 | 1443 | { |
342dfc30 | 1444 | DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name); |
1da177e4 LT |
1445 | struct sock *sk = sock->sk; |
1446 | struct sockaddr_ax25 sax; | |
1447 | struct sk_buff *skb; | |
1448 | ax25_digi dtmp, *dp; | |
1da177e4 LT |
1449 | ax25_cb *ax25; |
1450 | size_t size; | |
1451 | int lv, err, addr_len = msg->msg_namelen; | |
1452 | ||
1453 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) | |
1454 | return -EINVAL; | |
1455 | ||
1456 | lock_sock(sk); | |
3200392b | 1457 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
1458 | |
1459 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1460 | err = -EADDRNOTAVAIL; | |
1461 | goto out; | |
1462 | } | |
1463 | ||
1464 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1465 | send_sig(SIGPIPE, current, 0); | |
1466 | err = -EPIPE; | |
1467 | goto out; | |
1468 | } | |
1469 | ||
1470 | if (ax25->ax25_dev == NULL) { | |
1471 | err = -ENETUNREACH; | |
1472 | goto out; | |
1473 | } | |
1474 | ||
1475 | if (len > ax25->ax25_dev->dev->mtu) { | |
1476 | err = -EMSGSIZE; | |
1477 | goto out; | |
1478 | } | |
528930b9 | 1479 | |
1da177e4 LT |
1480 | if (usax != NULL) { |
1481 | if (usax->sax25_family != AF_AX25) { | |
1482 | err = -EINVAL; | |
1483 | goto out; | |
1484 | } | |
1485 | ||
27d1cba2 | 1486 | if (addr_len == sizeof(struct sockaddr_ax25)) |
1487 | /* ax25_sendmsg(): uses obsolete socket structure */ | |
1488 | ; | |
1489 | else if (addr_len != sizeof(struct full_sockaddr_ax25)) | |
1490 | /* support for old structure may go away some time | |
1491 | * ax25_sendmsg(): uses old (6 digipeater) | |
1492 | * socket structure. | |
1493 | */ | |
1da177e4 | 1494 | if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || |
528930b9 YH |
1495 | (addr_len > sizeof(struct full_sockaddr_ax25))) { |
1496 | err = -EINVAL; | |
1da177e4 LT |
1497 | goto out; |
1498 | } | |
1499 | ||
1da177e4 LT |
1500 | |
1501 | if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) { | |
1502 | int ct = 0; | |
1503 | struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax; | |
1504 | ||
1505 | /* Valid number of digipeaters ? */ | |
1506 | if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) { | |
1507 | err = -EINVAL; | |
1508 | goto out; | |
1509 | } | |
1510 | ||
1511 | dtmp.ndigi = usax->sax25_ndigis; | |
1512 | ||
1513 | while (ct < usax->sax25_ndigis) { | |
1514 | dtmp.repeated[ct] = 0; | |
1515 | dtmp.calls[ct] = fsa->fsa_digipeater[ct]; | |
1516 | ct++; | |
1517 | } | |
1518 | ||
1519 | dtmp.lastrepeat = 0; | |
1520 | } | |
1521 | ||
1522 | sax = *usax; | |
1523 | if (sk->sk_type == SOCK_SEQPACKET && | |
1524 | ax25cmp(&ax25->dest_addr, &sax.sax25_call)) { | |
1525 | err = -EISCONN; | |
1526 | goto out; | |
1527 | } | |
1528 | if (usax->sax25_ndigis == 0) | |
1529 | dp = NULL; | |
1530 | else | |
1531 | dp = &dtmp; | |
1532 | } else { | |
1533 | /* | |
1534 | * FIXME: 1003.1g - if the socket is like this because | |
1535 | * it has become closed (not started closed) and is VC | |
1536 | * we ought to SIGPIPE, EPIPE | |
1537 | */ | |
1538 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1539 | err = -ENOTCONN; | |
1540 | goto out; | |
1541 | } | |
1542 | sax.sax25_family = AF_AX25; | |
1543 | sax.sax25_call = ax25->dest_addr; | |
1544 | dp = ax25->digipeat; | |
1545 | } | |
1546 | ||
1da177e4 | 1547 | /* Build a packet */ |
1da177e4 LT |
1548 | /* Assume the worst case */ |
1549 | size = len + ax25->ax25_dev->dev->hard_header_len; | |
1550 | ||
1551 | skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err); | |
1552 | if (skb == NULL) | |
1553 | goto out; | |
1554 | ||
1555 | skb_reserve(skb, size - len); | |
1556 | ||
1da177e4 | 1557 | /* User data follows immediately after the AX.25 data */ |
6ce8e9ce | 1558 | if (memcpy_from_msg(skb_put(skb, len), msg, len)) { |
1da177e4 LT |
1559 | err = -EFAULT; |
1560 | kfree_skb(skb); | |
1561 | goto out; | |
1562 | } | |
1563 | ||
c1d2bbe1 | 1564 | skb_reset_network_header(skb); |
1da177e4 LT |
1565 | |
1566 | /* Add the PID if one is not supplied by the user in the skb */ | |
967b05f6 | 1567 | if (!ax25->pidincl) |
d58ff351 | 1568 | *(u8 *)skb_push(skb, 1) = sk->sk_protocol; |
1da177e4 | 1569 | |
1da177e4 LT |
1570 | if (sk->sk_type == SOCK_SEQPACKET) { |
1571 | /* Connected mode sockets go via the LAPB machine */ | |
1572 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1573 | kfree_skb(skb); | |
1574 | err = -ENOTCONN; | |
1575 | goto out; | |
1576 | } | |
1577 | ||
1578 | /* Shove it onto the queue and kick */ | |
1579 | ax25_output(ax25, ax25->paclen, skb); | |
1580 | ||
1581 | err = len; | |
1582 | goto out; | |
1583 | } | |
1584 | ||
967b05f6 | 1585 | skb_push(skb, 1 + ax25_addr_size(dp)); |
1da177e4 | 1586 | |
8849b720 | 1587 | /* Building AX.25 Header */ |
1da177e4 LT |
1588 | |
1589 | /* Build an AX.25 header */ | |
967b05f6 ACM |
1590 | lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call, |
1591 | dp, AX25_COMMAND, AX25_MODULUS); | |
1da177e4 | 1592 | |
967b05f6 | 1593 | skb_set_transport_header(skb, lv); |
1da177e4 | 1594 | |
9c70220b | 1595 | *skb_transport_header(skb) = AX25_UI; |
1da177e4 LT |
1596 | |
1597 | /* Datagram frames go straight out of the door as UI */ | |
29c4be51 | 1598 | ax25_queue_xmit(skb, ax25->ax25_dev->dev); |
1da177e4 LT |
1599 | |
1600 | err = len; | |
1601 | ||
1602 | out: | |
1603 | release_sock(sk); | |
1604 | ||
1605 | return err; | |
1606 | } | |
1607 | ||
1b784140 YX |
1608 | static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1609 | int flags) | |
1da177e4 LT |
1610 | { |
1611 | struct sock *sk = sock->sk; | |
1612 | struct sk_buff *skb; | |
1613 | int copied; | |
1614 | int err = 0; | |
1615 | ||
1616 | lock_sock(sk); | |
1617 | /* | |
1618 | * This works for seqpacket too. The receiver has ordered the | |
1619 | * queue for us! We do one quick check first though | |
1620 | */ | |
1621 | if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) { | |
1622 | err = -ENOTCONN; | |
1623 | goto out; | |
1624 | } | |
1625 | ||
1626 | /* Now we can treat all alike */ | |
1627 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
528930b9 | 1628 | flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1629 | if (skb == NULL) |
1630 | goto out; | |
1631 | ||
3200392b | 1632 | if (!sk_to_ax25(sk)->pidincl) |
1da177e4 LT |
1633 | skb_pull(skb, 1); /* Remove PID */ |
1634 | ||
badff6d0 ACM |
1635 | skb_reset_transport_header(skb); |
1636 | copied = skb->len; | |
1da177e4 LT |
1637 | |
1638 | if (copied > size) { | |
1639 | copied = size; | |
1640 | msg->msg_flags |= MSG_TRUNC; | |
1641 | } | |
1642 | ||
51f3d02b | 1643 | skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 | 1644 | |
f3d33426 | 1645 | if (msg->msg_name) { |
1da177e4 LT |
1646 | ax25_digi digi; |
1647 | ax25_address src; | |
98e399f8 | 1648 | const unsigned char *mac = skb_mac_header(skb); |
342dfc30 | 1649 | DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name); |
1da177e4 | 1650 | |
ef3313e8 | 1651 | memset(sax, 0, sizeof(struct full_sockaddr_ax25)); |
98e399f8 ACM |
1652 | ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL, |
1653 | &digi, NULL, NULL); | |
1da177e4 LT |
1654 | sax->sax25_family = AF_AX25; |
1655 | /* We set this correctly, even though we may not let the | |
1656 | application know the digi calls further down (because it | |
1657 | did NOT ask to know them). This could get political... **/ | |
1658 | sax->sax25_ndigis = digi.ndigi; | |
1659 | sax->sax25_call = src; | |
1660 | ||
1661 | if (sax->sax25_ndigis != 0) { | |
1662 | int ct; | |
1663 | struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax; | |
1664 | ||
1665 | for (ct = 0; ct < digi.ndigi; ct++) | |
1666 | fsa->fsa_digipeater[ct] = digi.calls[ct]; | |
1667 | } | |
1668 | msg->msg_namelen = sizeof(struct full_sockaddr_ax25); | |
1669 | } | |
1670 | ||
1671 | skb_free_datagram(sk, skb); | |
1672 | err = copied; | |
1673 | ||
1674 | out: | |
1675 | release_sock(sk); | |
1676 | ||
1677 | return err; | |
1678 | } | |
1679 | ||
1680 | static int ax25_shutdown(struct socket *sk, int how) | |
1681 | { | |
1682 | /* FIXME - generate DM and RNR states */ | |
1683 | return -EOPNOTSUPP; | |
1684 | } | |
1685 | ||
1686 | static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1687 | { | |
1688 | struct sock *sk = sock->sk; | |
1689 | void __user *argp = (void __user *)arg; | |
1690 | int res = 0; | |
1691 | ||
1692 | lock_sock(sk); | |
1693 | switch (cmd) { | |
1694 | case TIOCOUTQ: { | |
1695 | long amount; | |
31e6d363 ED |
1696 | |
1697 | amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
1da177e4 LT |
1698 | if (amount < 0) |
1699 | amount = 0; | |
1700 | res = put_user(amount, (int __user *)argp); | |
1701 | break; | |
1702 | } | |
1703 | ||
1704 | case TIOCINQ: { | |
1705 | struct sk_buff *skb; | |
1706 | long amount = 0L; | |
1707 | /* These two are safe on a single CPU system as only user tasks fiddle here */ | |
1708 | if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) | |
1709 | amount = skb->len; | |
20b7d10a | 1710 | res = put_user(amount, (int __user *) argp); |
1da177e4 LT |
1711 | break; |
1712 | } | |
1713 | ||
1da177e4 LT |
1714 | case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */ |
1715 | case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */ | |
1716 | case SIOCAX25GETUID: { | |
1717 | struct sockaddr_ax25 sax25; | |
1718 | if (copy_from_user(&sax25, argp, sizeof(sax25))) { | |
1719 | res = -EFAULT; | |
1720 | break; | |
1721 | } | |
1722 | res = ax25_uid_ioctl(cmd, &sax25); | |
1723 | break; | |
1724 | } | |
1725 | ||
1726 | case SIOCAX25NOUID: { /* Set the default policy (default/bar) */ | |
1727 | long amount; | |
1728 | if (!capable(CAP_NET_ADMIN)) { | |
1729 | res = -EPERM; | |
1730 | break; | |
1731 | } | |
1732 | if (get_user(amount, (long __user *)argp)) { | |
1733 | res = -EFAULT; | |
1734 | break; | |
1735 | } | |
76887753 | 1736 | if (amount < 0 || amount > AX25_NOUID_BLOCK) { |
1da177e4 LT |
1737 | res = -EINVAL; |
1738 | break; | |
1739 | } | |
1740 | ax25_uid_policy = amount; | |
1741 | res = 0; | |
1742 | break; | |
1743 | } | |
1744 | ||
1745 | case SIOCADDRT: | |
1746 | case SIOCDELRT: | |
1747 | case SIOCAX25OPTRT: | |
1748 | if (!capable(CAP_NET_ADMIN)) { | |
1749 | res = -EPERM; | |
1750 | break; | |
1751 | } | |
1752 | res = ax25_rt_ioctl(cmd, argp); | |
1753 | break; | |
1754 | ||
1755 | case SIOCAX25CTLCON: | |
1756 | if (!capable(CAP_NET_ADMIN)) { | |
1757 | res = -EPERM; | |
1758 | break; | |
1759 | } | |
1760 | res = ax25_ctl_ioctl(cmd, argp); | |
1761 | break; | |
1762 | ||
1763 | case SIOCAX25GETINFO: | |
1764 | case SIOCAX25GETINFOOLD: { | |
3200392b | 1765 | ax25_cb *ax25 = sk_to_ax25(sk); |
1da177e4 LT |
1766 | struct ax25_info_struct ax25_info; |
1767 | ||
1768 | ax25_info.t1 = ax25->t1 / HZ; | |
1769 | ax25_info.t2 = ax25->t2 / HZ; | |
1770 | ax25_info.t3 = ax25->t3 / HZ; | |
1771 | ax25_info.idle = ax25->idle / (60 * HZ); | |
1772 | ax25_info.n2 = ax25->n2; | |
1773 | ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ; | |
1774 | ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ; | |
1775 | ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ; | |
1776 | ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ); | |
1777 | ax25_info.n2count = ax25->n2count; | |
1778 | ax25_info.state = ax25->state; | |
407fc5cf ED |
1779 | ax25_info.rcv_q = sk_rmem_alloc_get(sk); |
1780 | ax25_info.snd_q = sk_wmem_alloc_get(sk); | |
1da177e4 LT |
1781 | ax25_info.vs = ax25->vs; |
1782 | ax25_info.vr = ax25->vr; | |
1783 | ax25_info.va = ax25->va; | |
1784 | ax25_info.vs_max = ax25->vs; /* reserved */ | |
1785 | ax25_info.paclen = ax25->paclen; | |
1786 | ax25_info.window = ax25->window; | |
1787 | ||
1788 | /* old structure? */ | |
1789 | if (cmd == SIOCAX25GETINFOOLD) { | |
1790 | static int warned = 0; | |
1791 | if (!warned) { | |
1792 | printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n", | |
1793 | current->comm); | |
1794 | warned=1; | |
1795 | } | |
1796 | ||
1797 | if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) { | |
1798 | res = -EFAULT; | |
1799 | break; | |
1800 | } | |
1801 | } else { | |
1802 | if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) { | |
1803 | res = -EINVAL; | |
1804 | break; | |
1805 | } | |
1806 | } | |
1807 | res = 0; | |
1808 | break; | |
1809 | } | |
1810 | ||
1811 | case SIOCAX25ADDFWD: | |
1812 | case SIOCAX25DELFWD: { | |
1813 | struct ax25_fwd_struct ax25_fwd; | |
1814 | if (!capable(CAP_NET_ADMIN)) { | |
1815 | res = -EPERM; | |
1816 | break; | |
1817 | } | |
1818 | if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) { | |
1819 | res = -EFAULT; | |
1820 | break; | |
1821 | } | |
1822 | res = ax25_fwd_ioctl(cmd, &ax25_fwd); | |
1823 | break; | |
1824 | } | |
1825 | ||
1826 | case SIOCGIFADDR: | |
1827 | case SIOCSIFADDR: | |
1828 | case SIOCGIFDSTADDR: | |
1829 | case SIOCSIFDSTADDR: | |
1830 | case SIOCGIFBRDADDR: | |
1831 | case SIOCSIFBRDADDR: | |
1832 | case SIOCGIFNETMASK: | |
1833 | case SIOCSIFNETMASK: | |
1834 | case SIOCGIFMETRIC: | |
1835 | case SIOCSIFMETRIC: | |
1836 | res = -EINVAL; | |
1837 | break; | |
1838 | ||
1839 | default: | |
b5e5fa5e | 1840 | res = -ENOIOCTLCMD; |
1da177e4 LT |
1841 | break; |
1842 | } | |
1843 | release_sock(sk); | |
1844 | ||
1845 | return res; | |
1846 | } | |
1847 | ||
1848 | #ifdef CONFIG_PROC_FS | |
1849 | ||
1850 | static void *ax25_info_start(struct seq_file *seq, loff_t *pos) | |
f16f3026 | 1851 | __acquires(ax25_list_lock) |
1da177e4 | 1852 | { |
1da177e4 | 1853 | spin_lock_bh(&ax25_list_lock); |
b512f3d8 | 1854 | return seq_hlist_start(&ax25_list, *pos); |
1da177e4 LT |
1855 | } |
1856 | ||
1857 | static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos) | |
1858 | { | |
b512f3d8 | 1859 | return seq_hlist_next(v, &ax25_list, pos); |
1da177e4 | 1860 | } |
528930b9 | 1861 | |
1da177e4 | 1862 | static void ax25_info_stop(struct seq_file *seq, void *v) |
f16f3026 | 1863 | __releases(ax25_list_lock) |
1da177e4 LT |
1864 | { |
1865 | spin_unlock_bh(&ax25_list_lock); | |
1866 | } | |
1867 | ||
1868 | static int ax25_info_show(struct seq_file *seq, void *v) | |
1869 | { | |
b512f3d8 | 1870 | ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node); |
f75268cd | 1871 | char buf[11]; |
1da177e4 LT |
1872 | int k; |
1873 | ||
1874 | ||
1875 | /* | |
1876 | * New format: | |
1877 | * magic dev src_addr dest_addr,digi1,digi2,.. st vs vr va t1 t1 t2 t2 t3 t3 idle idle n2 n2 rtt window paclen Snd-Q Rcv-Q inode | |
1878 | */ | |
1879 | ||
966cddef FH |
1880 | seq_printf(seq, "%p %s %s%s ", |
1881 | ax25, | |
1da177e4 | 1882 | ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name, |
f75268cd | 1883 | ax2asc(buf, &ax25->source_addr), |
1da177e4 | 1884 | ax25->iamdigi? "*":""); |
f75268cd | 1885 | seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr)); |
1da177e4 LT |
1886 | |
1887 | for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) { | |
1888 | seq_printf(seq, ",%s%s", | |
f75268cd | 1889 | ax2asc(buf, &ax25->digipeat->calls[k]), |
1da177e4 LT |
1890 | ax25->digipeat->repeated[k]? "*":""); |
1891 | } | |
1892 | ||
1893 | seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d", | |
1894 | ax25->state, | |
1895 | ax25->vs, ax25->vr, ax25->va, | |
1896 | ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ, | |
1897 | ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ, | |
1898 | ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ, | |
1899 | ax25_display_timer(&ax25->idletimer) / (60 * HZ), | |
1900 | ax25->idle / (60 * HZ), | |
1901 | ax25->n2count, ax25->n2, | |
1902 | ax25->rtt / HZ, | |
1903 | ax25->window, | |
1904 | ax25->paclen); | |
1905 | ||
1906 | if (ax25->sk != NULL) { | |
1105b5d1 | 1907 | seq_printf(seq, " %d %d %lu\n", |
31e6d363 ED |
1908 | sk_wmem_alloc_get(ax25->sk), |
1909 | sk_rmem_alloc_get(ax25->sk), | |
1105b5d1 | 1910 | sock_i_ino(ax25->sk)); |
1da177e4 LT |
1911 | } else { |
1912 | seq_puts(seq, " * * *\n"); | |
1913 | } | |
1914 | return 0; | |
1915 | } | |
1916 | ||
56b3d975 | 1917 | static const struct seq_operations ax25_info_seqops = { |
1da177e4 LT |
1918 | .start = ax25_info_start, |
1919 | .next = ax25_info_next, | |
1920 | .stop = ax25_info_stop, | |
1921 | .show = ax25_info_show, | |
1922 | }; | |
1da177e4 LT |
1923 | #endif |
1924 | ||
ec1b4cf7 | 1925 | static const struct net_proto_family ax25_family_ops = { |
1da177e4 LT |
1926 | .family = PF_AX25, |
1927 | .create = ax25_create, | |
1928 | .owner = THIS_MODULE, | |
1929 | }; | |
1930 | ||
90ddc4f0 | 1931 | static const struct proto_ops ax25_proto_ops = { |
4676356b RB |
1932 | .family = PF_AX25, |
1933 | .owner = THIS_MODULE, | |
1934 | .release = ax25_release, | |
1935 | .bind = ax25_bind, | |
1936 | .connect = ax25_connect, | |
1937 | .socketpair = sock_no_socketpair, | |
1938 | .accept = ax25_accept, | |
1939 | .getname = ax25_getname, | |
a11e1d43 | 1940 | .poll = datagram_poll, |
4676356b | 1941 | .ioctl = ax25_ioctl, |
c7cbdbf2 | 1942 | .gettstamp = sock_gettstamp, |
4676356b RB |
1943 | .listen = ax25_listen, |
1944 | .shutdown = ax25_shutdown, | |
1945 | .setsockopt = ax25_setsockopt, | |
1946 | .getsockopt = ax25_getsockopt, | |
1947 | .sendmsg = ax25_sendmsg, | |
1948 | .recvmsg = ax25_recvmsg, | |
1949 | .mmap = sock_no_mmap, | |
1950 | .sendpage = sock_no_sendpage, | |
1da177e4 LT |
1951 | }; |
1952 | ||
1953 | /* | |
1954 | * Called by socket.c on kernel start up | |
1955 | */ | |
7546dd97 | 1956 | static struct packet_type ax25_packet_type __read_mostly = { |
09640e63 | 1957 | .type = cpu_to_be16(ETH_P_AX25), |
1da177e4 LT |
1958 | .func = ax25_kiss_rcv, |
1959 | }; | |
1960 | ||
1961 | static struct notifier_block ax25_dev_notifier = { | |
351638e7 | 1962 | .notifier_call = ax25_device_event, |
1da177e4 LT |
1963 | }; |
1964 | ||
1da177e4 LT |
1965 | static int __init ax25_init(void) |
1966 | { | |
1967 | int rc = proto_register(&ax25_proto, 0); | |
1968 | ||
1969 | if (rc != 0) | |
1970 | goto out; | |
1971 | ||
1972 | sock_register(&ax25_family_ops); | |
1973 | dev_add_pack(&ax25_packet_type); | |
1974 | register_netdevice_notifier(&ax25_dev_notifier); | |
1da177e4 | 1975 | |
fddda2b7 CH |
1976 | proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops); |
1977 | proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops); | |
1978 | proc_create_seq("ax25_calls", 0444, init_net.proc_net, | |
1979 | &ax25_uid_seqops); | |
1da177e4 LT |
1980 | out: |
1981 | return rc; | |
1982 | } | |
1983 | module_init(ax25_init); | |
1984 | ||
1985 | ||
1986 | MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); | |
1987 | MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol"); | |
1988 | MODULE_LICENSE("GPL"); | |
1989 | MODULE_ALIAS_NETPROTO(PF_AX25); | |
1990 | ||
1991 | static void __exit ax25_exit(void) | |
1992 | { | |
ece31ffd G |
1993 | remove_proc_entry("ax25_route", init_net.proc_net); |
1994 | remove_proc_entry("ax25", init_net.proc_net); | |
1995 | remove_proc_entry("ax25_calls", init_net.proc_net); | |
1da177e4 | 1996 | |
1da177e4 LT |
1997 | unregister_netdevice_notifier(&ax25_dev_notifier); |
1998 | ||
1999 | dev_remove_pack(&ax25_packet_type); | |
2000 | ||
2001 | sock_unregister(PF_AX25); | |
2002 | proto_unregister(&ax25_proto); | |
3adadc08 EB |
2003 | |
2004 | ax25_rt_free(); | |
2005 | ax25_uid_free(); | |
2006 | ax25_dev_free(); | |
1da177e4 LT |
2007 | } |
2008 | module_exit(ax25_exit); |